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Pension and Other Postretirement Benefits - Narrative (Details) - USD ($) $ in Millions	2 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer matching contribution percentage		80.00%
Maximum percentage of employee's compensation eligible for employer matching contributions		5.00%
Additional employer annual contribution percentage		5.00%
Charges for defined contribution plans		$ 16.6	$ 15.3	$ 15.0
UNITED STATES
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected return on plan assets	4.50%	3.00%	4.25%	5.00%
Decrease in rate of return on plan assets		1.25%
Estimated inflation rate assumptions for rate of return on plan assets		2.10%
UNITED STATES | Fixed Income Investments
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target asset allocation		100.00%
Pensions
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accumulated benefit obligation		$ 1,435.9	$ 1,364.2
Curtailment loss and special termination benefits				$ 4.3
Expected return on plan assets		3.00%	4.25%	5.00%

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Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
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Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

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Amount of cost for defined contribution plan.

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Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

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